Recognised as Chemical formula
O2
- Dioxygen
- Formula
- 31.998 g/mol
- 2 atoms
O2 is dioxygen. It has a molar mass of 31.998 g/mol, made up of 2 atoms across 1 element: 2 × O.
Molar mass
Molar mass31.998 g/mol
Total atoms per molecule2
Distinct elements1
Mass of one molecule5.3133929 × 10^-23 g
Molecules per gram1.8820366 × 10^22
Name
NameDioxygen
Also calledoxygen gas
SourceNerdulator compound names, September 2026. Systematic names follow the IUPAC Red Book (2005) and Blue Book (2013)
Composition by mass
O100%
Oxygen (O × 2)31.998 g/mol, 100%
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